A027125 a(n) = A027113(n, 2n-7).

1, 4, 13, 44, 149, 500, 1660, 5444, 17640, 56524, 179322, 563932, 1759982, 5456608, 16821309, 51600720, 157615653, 479664388, 1455061181, 4401607356, 13282579293, 39997017088, 120215762283, 360730451088, 1080880047091

Offset: 4

Author

Clark Kimberling

Keywords

• nonn